BMC13. Random Resonator in "Optical Illusion Plaid"

This is a completely unique "waveshaper"/"harmonic sweetener" type of module. A series of pulses is triggered in unison with your oscillator signal adding new harmonic content. The only controls for these pulses are the "New" button which makes it randomly generate a new series, and the "Complexity" control which limits the number of pulses, length of pulses and variety of amplitudes. The "Track" switch turns on self-tracking mode where at the end of a series of pulses it starts over again instead of waiting for your oscillators next cycle, creating wild sync type sounds. Complexity and the "new" command can both by external sources, and there's a dedicated output for just the new harmonics as well as one with a variable blend.

Here is an MP3 of a saw tooth wave being fed into the Random Resonator. At the start of each sequence, a new timbre is created.
Here is an MP3 of the Resonator's timbres without any of the input signal mixed back in.
Here is an MP3 of the Resonator in "loop" mode, with no input oscillator.
Check out a mumbly demo video of the module on youtube

WIDTH = 6HP
DEPTH = 55MM
POSITIVE CURRENT DRAW = 7ma
NEGATIVE CURRENT DRAW = 2ma
PRICE = $100

There are currently 4 available.
You could definitely build this module yourself. PCB/PICs are available for DIYers.